What Video Card?

I use my machine mainly for photo and video editing, surfing....no gaming. However, videos and large amounts of photos really slows down my machine. I have a 3 GHZ Pentium and 1024 MB RAM, so I am thinking the video card (NVidia GForce2 MX100/200) is probably the culprit. Keeping affordability hi on my list of prioroties, what is a sufficient card for my money??